Depending on your budget, I would consider something more than the MAX BR1 MK2. It has less band support than many of the other routers which means it might have difficulty with some of the newer towers and frequencies. While you might not see 5G everywhere, the 5G routers do have support for more bands, like Band 71, which aren’t 5G, but are much better at longer distances, and are popping up in a lot of areas.
I would also re-evaluate your cable lengths and placement. Anything more than about 20 feet of cable is a concern when I design a solution. Beyond that, especially with any connectors or joints, you’re getting close to impacting the overall benefit of an antenna because of loss for the length of the cable and those connectors. If it is going past other wires that could cause interference, that could go up quite a bit.
I never exceed the pre-built 6’ cable length on an antenna, plus one 15’ extension, on any installations. Getting the antenna higher, as on a spreader, won’t matter as much compared to the loss you’ll induce.